I would recommend that GFB Hybrid.
I first heard it on another members car and decided I wanted.
A few others are using the same, I run it in 50/50 (recirc/VTA)
Its adjustable plus Australian.
Clicky link below
Go Fast Bits
you want;
Part # 1017
Suits Nissan Skyline GTS-T R32-34, R35 GTR, Mazda 3 & 6 MPS and CX7. Note that the Whistling trumpet (part # 5701) is compatible with this version.
MY16 WRX STi Crystal White Pearl
-= Rally Armour Flaps - 2XS Muffler Delete =-
FG FPV F6 MKII Vixen - SOLD
-= Bluepower SRI - ID1000 Injectors - Venom Cat - XCAL3 - ProcessWest Stg2 Intercooler - 359 RWKW=-
CX9 Grand Touring Stormy Blue
-= The rolling armchair =-
6 MPS Velocity Red - SOLD
-=Cat Back Exhaust - Pirelli PZero=-
3 MPS Aurora Blue - SOLD
-=PG SRI - PG Inlet - ETS TMIC - GFB Hybrid BOV - Best Mufflers DP - Eibach Pro - AccessPort STG2 - Autotech HPFP - ITV22 - Michelin PSS=-